Establishing BIM models is crucial for the successful completion of BIM projects. The standards for model creation play a key role in ensuring the smooth progress of the project. Today, we will discuss the standards for establishing and applying BIM models.
1. BIM Building Modeling Standards
Precast and prefabricated building components can be incorporated within the BIM model by placing objects accordingly.
Building components must be created using the appropriate tools. If existing tools are insufficient, suitable alternatives should be selected.
While the tool is used to construct the object, the ‘type’ of the object must be clearly defined.
Components smaller than the modeling requirements do not need to be modeled in 3D and can be supplemented with 2D drawings for clarity.
2D detailed drawings are recommended to enhance the explanation of the BIM model.
Building components should be modeled separately by floor.
Required parameters include type, material ID, and size, with the ‘type’ parameter serving as the basis for quantity extraction.
If multiple tools can be used to create a component, the finished component should be defined by its “type”. For example, if both ‘version’ and ‘beam’ tools can create a “road”, its ‘type’ should be set as “road”.
Structural components must be modeled according to the dimensions provided by the structural engineer.
2. BIM Structural Modeling Standards
Contractors and subcontractors should collaboratively adjust the detailed model to match the construction assembly method. When necessary, the structural model should be enhanced with manufacturing drawings.
The structural consultant will develop both a structural analysis model and a structural BIM model based on actual component positions and dimensions, producing structural documentation.
Precast and prefabricated structural components can be designed using specialized tools and integrated into the structural BIM model after their creation.
The structural BIM model should include all load-bearing concrete, wood, and steel elements, as well as non-load-bearing concrete structures. Basic components like walls, slabs, beams, and lattice frames must be modeled using the correct tools (e.g., wall or slab tools). If proper tools are unavailable, alternative tools can be used, ensuring the component’s “type” is properly defined.
The structural model can be divided into stages according to structural approval processes.
Detailed modeling of steel bars and joints should be done using appropriate tools during the detailed design phase.
Components smaller than the modeling threshold, for example less than 10 centimeters, do not require 3D modeling but can be represented with 2D drawings.
2D graphics can also be used for load planning.
If BIM modeling software is limited, 2D drawings can be utilized to create column details, including shape and cross-section.
Structural components must be arranged by floor level.
Required parameters include type, material, ID code, and size, with the ‘type’ parameter used for quantity extraction.
If multiple tools can create a component, it must be clearly classified by its ‘type’. For example, individual beams forming a roof truss should be grouped and labeled as “Truss”.
3. BIM Mechanical and Electrical (MEP) Modeling Standards
Special attention should be given to modeling critical parts.
Clearly mark any changes made by the construction contractor that have been approved by the engineering consultant.
Objects unavailable in BIM modeling tools may be replaced with box shapes, but these must be labeled with names and assigned appropriate parameters.
The elevation of each system component should be clearly indicated, referencing the completed floor level or other datum planes.
If necessary, models of fasteners and suspension parts can be created.
Attribute Data Standards
Users should complete the “Completed Model Attribute Data Standard Fields” to classify each COBie worksheet. This ensures the domain name and management data required for construction permits are properly displayed.
That concludes our overview of the standards for establishing and applying BIM models. We hope this article has been helpful!
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